LTE FDD
The LTE FDD application provides two waveform generation methods: Waveform Playback (ARB) and Real-Time Uplink. Use the Capability setting to select one of these methods. This topic describes the Basic settings for both methods.
Auto Waveform Sampling Rate Mode
Sets waveform generation method, Waveform Playback (ARB) based or Real-time based generation.
When this setting is changed, the current settings are preset, and the default carrier(s) is configured for each capability mode. The settings of the initial carrier are preset to the default values.
This selection is hidden when the capability setting is not available. The Waveform Playback mode is used when this selection is hidden.
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform:CAPability ARB|RTIMe [:SOURce]:RADio:LTEFdd:WAVeform:CAPability? |
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SCPI Example |
:RAD:LTEF:WAV:CAP ARB :RAD:LTEF:WAV:CAP? |
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Notes |
Real-Time Uplink is available on MCS3. This setting is hidden when an embedded hardware does not support the Real-Time Uplink capability. |
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Runtime Apply |
No |
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State Saved |
Yes |
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Preset |
ARB |
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Range |
Waveform Playback | Real-Time Uplink |
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Initial S/W Revision |
A.14 |
Displays the waveform output configuration. Use the Output Configuration button to set value.
This setting is indicator of the Outputs Configuration command.
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Notes |
GUI: Read only |
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Initial S/W Revision |
A.14.00 |
Waveform Playback (ARB) only.
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:COMMent <string> [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:COMMent? |
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SCPI Example |
:RAD:LTEF:WAV:COMM "Sample Data" :RAD:LTEF:WAV:COMM? |
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State Saved |
Yes |
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Preset |
"" |
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Initial S/W Revision |
A.14.00 |
Waveform Playback (ARB) only.
This parameter returns the total sample points of waveform.
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:SAMPles:COUNt? |
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SCPI Example |
:RAD:LTEF:WAV:SAMP:COUN? |
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Notes |
Query only |
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State Saved |
No |
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Preset |
1228800 |
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Initial S/W Revision |
A.14.00 |
Waveform Playback (ARB) only.
This parameter sets the mode of sampling rate control.
Auto enabled: Sampling Rate is calculated based on each carriers' settings
Manual (Auto disabled): Uses Waveform Sampling Rate value as a target sampling rate
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:SRATe:AUTO[:STATe] OFF|ON|0|1 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:SRATe:AUTO[:STATe]? |
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SCPI Example |
:RAD:LTEF:WAV:SRAT:AUTO ON :RAD:LTEF:WAV:SRAT:AUTO? |
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State Saved |
Yes |
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Preset |
On |
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Initial S/W Revision |
A.14.00 |
This parameter sets sampling rate of waveform generation.
This cell is read-only.
Waveform Sampling Rate value is calculated based on each carrier settings; Sampling Rate is directly related to the oversampling rate value selected and/or frequency offset value. (Increasing the frequency offset increases the sampling rate.)
After waveform generation has been finished, value is refreshed and up to date.
This cell is editable.
Waveform Sampling Rate value is used as the waveform sampling rate to generate waveform.
Range: (depends on the target instrument.)
Default: (depends on the target instrument, typical 30.72 Msps)
Minimum value is the Least Common Multiple (LCM) value of Base Sampling Rate of carriers or Instrument minimum sampling rate.
Value should be the multiple of LCM value of Base Sampling Rate values within 30.72 Msps.
Minimum value is 1.92 Msps or Instrument minimum sampling rate.
Value should be the multiple of Base Sampling Rate within 30.72 Msps, or the multiple of 30.72 Msps over 30.72 Msps.
This value is fixed to 30.72 MHz for all System Bandwidth settings.
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform:SRATe <real> [:SOURce]:RADio:LTEFdd:WAVeform:SRATe? |
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SCPI Example |
:RAD:LTEF:WAV:SRAT 20000000 :RAD:LTEF:WAV:SRAT? |
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Notes |
Unit in GUI: Sample/s |
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Dependencies |
This value is used when Auto Sampling Rate Mode is Off . |
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State Saved |
Yes |
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Initial S/W Revision |
A.14.00 |
Waveform Playback (ARB) only.
Time Scale Factor sets the value by which to scale the bandwidth and time lengths of the measured signal. This setting can be used to compensate for mis-tuned crystals or to allow demodulation of signals at a lower rate, such as half rate or 1/10 rate.
Examples
For a 1/10 rate signal, the Time Scale Factor would be 0.1.
For a crystal mistuned by 5 ppm, a value of 1.000005 or 0.999995 could be used.
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:TSFactor <real> [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:TSFactor? |
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SCPI Example |
:RAD:LTEF:WAV:TSF 1.0001 :RAD:LTEF:WAV:TSF? |
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State Saved |
Yes |
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Preset |
1 |
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Min |
0.001 |
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Max |
1000 |
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Resolution |
0.00000000000001 (number of decimal places is 14 digits) |
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Initial S/W Revision |
A.14.00 |
Waveform Playback (ARB) only.
Sets a normal or inverted I/Q signal.
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:IQMap NORMal|INVert [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:IQMap? |
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SCPI Example |
:RAD:LTEF:WAV:IQM NORM :RAD:LTEF:WAV:IQM? |
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State Saved |
Yes |
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Preset |
NORMal |
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Range |
Normal | Invert |
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Initial S/W Revision |
A.14.00 |
Waveform Playback (ARB) only.
Displays raw cubic metric which can be used for cubic metric (CM) calculation.
This parameter is not available when MIMO hardware configuration is selected.
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SCPI Command |
[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:RCMetric? |
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SCPI Example |
:RAD:LTEF:WAV:RCM? |
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Notes |
Query only Returns -99 when this setting is not available |
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State Saved |
No |
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Preset |
0.00 |
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Initial S/W Revision |
A.14.00 |